Tool 4905 | Canon Service

In the United States, the Digital Millennium Copyright Act (DMCA) includes an exemption for “repair of consumer devices.” However, Canon’s EULA (End User License Agreement) prohibits reverse engineering. Practically speaking, thousands of users reset counters daily without legal issue – but reselling a reset printer as “new” is fraud.

A: Possibly, but not necessarily. Clearing EEPROM resets the printer’s internal serial number and region settings. The printer may ask for a new print head alignment. Run the “EEPROM Print” button first to backup values (if available). Without a backup, your printer may become region-locked.

Q: Is Canon Service Tool 4905 free?
A: Yes, it is distributed for free online. Beware of scammers selling it. canon service tool 4905

Q: Will it work on macOS or Linux?
A: No. It requires Windows. You can run it via VirtualBox or Wine, but USB passthrough can be unreliable.

Q: My printer has error 6A80 (purge unit jam). Can ST4905 fix that?
A: No. 6A80 is a mechanical jam, not a counter overflow. You need to physically clean or replace the purge unit. In the United States, the Digital Millennium Copyright

Q: Can I use it to make my printer use cheaper third-party inks?
A: Indirectly yes – resetting ink levels allows refilled cartridges to be recognized as full.

Q: Does Canon know if I used the service tool?
A: Yes. The printer logs the service mode entry and reset events. However, Canon only checks this during paid repairs, not remotely. Print a nozzle check pattern or any document

Print a nozzle check pattern or any document. The error should be gone.

Canon Service Tool v4905 is often a "cracked" or patched version of official software not intended for public use. Consequently, Windows Defender and other antivirus software frequently flag the executable as malware or a trojan.